Opt in for Sexually explicit material on Instagram

Recently I've noticed that if you press the search magnifying glass in Instagram there is sexually explicit material just hanging out on that page. Why? I didn't want to see that, certainly we don't want our children to see it.

Furthermore, everyone talks about getting repeat follow requests from pornstars everyday on Instagram. I report them all and Instagram says they don't allow pornography so they shut down the acccount, but it happens all the time. Why isn't Instagram taking this more seriously if it's against their rules?

Help me make a change and only be able to see that stuff if you search it out.